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How large a tire can be squeezed into the Diverge carbon frame?
The OEM Roubaix 700x30/32 tires have a lot of clearance, so a larger tire with more volume and tread could be used for rough terrain. How much larger? To find out I mounted a set of Continental SpeedRide 700x42 tires (from my CAADX) on the Diverge Axis 4 wheels. The Roubaix tires came off easily due to the deep center channel in the Axis 4 rim. The wheels were also tubeless-ready with a full rim strip.
The Conti’s mounted easily, without levers, but required >70 psi to fully seat on the tall rim shelf. Not sure how this might affect changing a flat in the field. The tires, which measured 40mm wide, just did fit.
The tire molding nipples touched the frame with tight clearance in the fork, seatstays and chainstays being similar (~2mm clearance above and on each side). No room for mud or debris, and the tire would likely rub if the tire or rim went the slightest bit out of true.
Based on this I think the widest tire you can safely run is about 36mm. This is probably fine since the bike is more roughroad than dirt-sand-knarly gravel oriented.
For a bit more volume and tread than the Roubaix tires offer, one can use Continental Cyclocross 700x 35 tires (a set I have measure 36mm wide) or Specialized Trigger Pro 700x33 (the set on my wife’s bike measure 35mm wide). The heavy duty Specialized Trigger Pro 700x38 tires are also an option since they’ve been reported to be only 35mm wide (http://www.cxmagazine.com/specialized-trigger-pro-38c-2bliss-tire-review). There are several knobby cyclocross tires in the 32-34mm wide range that would also fit, but these seem to diverge from the bike’s intended purpose.
How about a 700x35 tire?
Mounted Continental Cyclocross 700x35 tires (measured width 36mm) on the Axis 4 rims, and they fit in the frame fine. The front tire has 4mm clearance on each side between the fork legs and 12mm to the fork crown.
The rear tire is a shade tighter, with about 3 mm between the sides of the tire and the seat and chainstays. Tire height was OK with 9mm to the seatstay bridge and 11mm to the seattube.
FWIW, I’m liking the 5mm hex-keyed thru axles. Simple and fast to insert and tighten with a T-type Allen wrench in the garage (no guesswork or adjusting lever positions), and easy enough with a regular 5mm hex key in the field. Very clean w/o levers sticking out.